2014-10-28  Richard Biener  <rguenther@suse.de>

	* gimple-fold.h (follow_single_use_edges): Declare.
	* gimple-fold.c (follow_single_use_edges): New function.
	(gimple_fold_stmt_to_constant_1): Dispatch to gimple_simplify.
	* tree-ssa-propagate.c
	(substitute_and_fold_dom_walker::before_dom_children): Allow
	following single-use edges when folding stmts we propagated into.

From-SVN: r216799